230SL front engine mount bolts

[saygold]

I am changing the engine mounts as part of the engine rebuild, and the rebound buffer bolts are different than the original ones.  I would appreciate having the dimensions for both the upper and lower bolts for the front engine mounts (SLS refers these as Rebound buffer bolts - lower and upper).

Thanks in advance for your help.

Ken Deter
'66 230SL (euro, 4-speed)

[Jonny B]

In the 250 SL (early)part book, the lower bolt is listed with a MB part number (127 220 00 71) the upper bolt is listed with a DIN number (000931 012120) according to the DIN conversion book this is a hex-head 8.8 M 12 x52 which means 8.8 is a strength rating, M is metric, 12 is the edge to edge screw diameter and 52 is the length. Dave G can confirm. Hope this helps.

Note - I only have an early 230 SL part book - Edition A, and there is no lower bolt listed

[Dave Gallon]

Yes, the upper bolts are exactly as previously described. Unfortunately, I do not have a lower bolt (127 220 00 71) that I can easily measure at this moment. I will follow up in a couple of weeks with the dimensions of the fastener. Also, I checked my Edition C 230SL parts book and the parts are unchanged.

[saygold]

Thanks for the help. 

I found my problem:  the bolts are both M12 x 52 mm for both the top and the bottom.  However, the length of the threads were different.  The bolt on the top required less threads when it went through the engine support arm.  The motor mount had been replaced in the past, and the bolts had been switched.

The bolt on the bottom could not be tightened completely due to lack of threads.  The bolt was fabricated to include a washer.  Should I add an additional washer to insure I can tighten the bottom bolt?  (I have not found the recommended torque for the top and bottom bolts).

Ken Deter
'66 230SL (euro, 4-Speed)